FAQ: Strategies for Complex State - Immutable Updates & Complex State

Frequently Asked Questions Uncategorized
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This community-built FAQ covers the “Immutable Updates & Complex State” exercise from the lesson “Strategies for Complex State”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Learn Redux

FAQs on the exercise Immutable Updates & Complex State

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Can someone help me to go deeper or explain what exactly all the code is doing?
I can answer these three problem with the help of hint, but actually I can’t understand what’s happening and the main idea in this section

thanks in advance

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3.

The final case to fix is for the favoriteRecipes/removeRecipe action type. This action will be dispatched with a payload whose value is the recipe object to be removed from the state.favoriteRecipes array.

For this question the solution was:

case 'favoriteRecipes/removeRecipe': return {...state, favoriteRecipes: state.favoriteRecipes.filter(element => element.id !== action.payload.id) } default: return state;

but where is element coming from??? I don’t see this defined anywhere else.

1 Like
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Codecademy just used element as a placeholder for each individual element of the state.favoriteRecipes array during the filtering process.

You could use another placeholder - e.g. I used recipe when completing this exercise:

  case "favoriteRecipes/removeRecipe":
      return {
        ...state,
        favoriteRecipes: state.favoriteRecipes.filter((recipe) => recipe.id !== action.payload.id),
      };
1 Like